Without a Google account, you'll no longer have access to some apps and services on your Android device, including the ones listed below:

Google Play: You won’t be able to download or update apps or games from the Play Store app. You also won’t be able to use music, movies, books, or magazines you purchased in Google Play. This includes any music you purchased outside of Google Play that was uploaded into your music locker. Game progress, achievements, and other data associated with your Google Account in Google Play Games may be lost.

Contacts: Any contact stored only in your Google Account will be lost. Contacts may also no longer sync to your devices.

Drive: Data will no longer be able to be saved to Drive or backed up through Android Backup Service. This includes photos you take with your device or documents downloaded from emails.